linux-kernel - Re: [PATCH v4 1/3] sparc: Use vmemmap_populate_hugepages for vmemmap

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Message-ID: <aVGao3KAyKxXrIo6@kernel.org>
Date: Sun, 28 Dec 2025 23:01:23 +0200
From: Mike Rapoport <rppt@...nel.org>
To: chengkaitao <pilgrimtao@...il.com>
Cc: davem@...emloft.net, andreas@...sler.com, akpm@...ux-foundation.org,
	david@...nel.org, lorenzo.stoakes@...cle.com,
	Liam.Howlett@...cle.com, vbabka@...e.cz, surenb@...gle.com,
	mhocko@...e.com, kevin.brodsky@....com, dave.hansen@...ux.intel.com,
	ziy@...dia.com, chengkaitao@...inos.cn, willy@...radead.org,
	zhengqi.arch@...edance.com, sparclinux@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH v4 1/3] sparc: Use vmemmap_populate_hugepages for
 vmemmap_populate

On Fri, Dec 19, 2025 at 07:58:10PM +0800, chengkaitao wrote:
> From: Chengkaitao <chengkaitao@...inos.cn>
> 
> 1. In the SPARC architecture, reimplemented vmemmap_populate using
> vmemmap_populate_hugepages.
> 2. Allow the SPARC arch to fallback to vmemmap_populate_basepages(),
> when vmemmap_alloc_block returns NULL.
> 
> Signed-off-by: Chengkaitao <chengkaitao@...inos.cn>

Acked-by: Mike Rapoport (Microsoft) <rppt@...nel.org>

> ---
>  arch/sparc/mm/init_64.c | 47 ++++++++++++++---------------------------
>  1 file changed, 16 insertions(+), 31 deletions(-)
> 
> diff --git a/arch/sparc/mm/init_64.c b/arch/sparc/mm/init_64.c
> index df9f7c444c39..858eaa6615ea 100644
> --- a/arch/sparc/mm/init_64.c
> +++ b/arch/sparc/mm/init_64.c
> @@ -2581,8 +2581,8 @@ unsigned long _PAGE_CACHE __read_mostly;
>  EXPORT_SYMBOL(_PAGE_CACHE);
>  
>  #ifdef CONFIG_SPARSEMEM_VMEMMAP
> -int __meminit vmemmap_populate(unsigned long vstart, unsigned long vend,
> -			       int node, struct vmem_altmap *altmap)
> +void __meminit vmemmap_set_pmd(pmd_t *pmd, void *p, int node,
> +			       unsigned long addr, unsigned long next)
>  {
>  	unsigned long pte_base;
>  
> @@ -2595,39 +2595,24 @@ int __meminit vmemmap_populate(unsigned long vstart, unsigned long vend,
>  
>  	pte_base |= _PAGE_PMD_HUGE;
>  
> -	vstart = vstart & PMD_MASK;
> -	vend = ALIGN(vend, PMD_SIZE);
> -	for (; vstart < vend; vstart += PMD_SIZE) {
> -		pgd_t *pgd = vmemmap_pgd_populate(vstart, node);
> -		unsigned long pte;
> -		p4d_t *p4d;
> -		pud_t *pud;
> -		pmd_t *pmd;
> -
> -		if (!pgd)
> -			return -ENOMEM;
> -
> -		p4d = vmemmap_p4d_populate(pgd, vstart, node);
> -		if (!p4d)
> -			return -ENOMEM;
> -
> -		pud = vmemmap_pud_populate(p4d, vstart, node);
> -		if (!pud)
> -			return -ENOMEM;
> +	pmd_val(*pmd) = pte_base | __pa(p);
> +}
>  
> -		pmd = pmd_offset(pud, vstart);
> -		pte = pmd_val(*pmd);
> -		if (!(pte & _PAGE_VALID)) {
> -			void *block = vmemmap_alloc_block(PMD_SIZE, node);
> +int __meminit vmemmap_check_pmd(pmd_t *pmdp, int node,
> +				unsigned long addr, unsigned long next)
> +{
> +	int large = pmd_leaf(*pmdp);
>  
> -			if (!block)
> -				return -ENOMEM;
> +	if (large)
> +		vmemmap_verify((pte_t *)pmdp, node, addr, next);
>  
> -			pmd_val(*pmd) = pte_base | __pa(block);
> -		}
> -	}
> +	return large;
> +}
>  
> -	return 0;
> +int __meminit vmemmap_populate(unsigned long vstart, unsigned long vend,
> +			       int node, struct vmem_altmap *altmap)
> +{
> +	return vmemmap_populate_hugepages(vstart, vend, node, altmap);
>  }
>  #endif /* CONFIG_SPARSEMEM_VMEMMAP */
>  
> -- 
> 2.50.1 (Apple Git-155)
> 

-- 
Sincerely yours,
Mike.